Heat retainer



J. F. LASZLO HEAT RETAINER Filed March 1, 1955 /5' INVENTOR. Ja/mf W @JZL@ Patented Apr. 28, 1936 UNITED; STATES Artnr OFFICE.

2 Claims.

My*y `invention relates to a new and useful improvement ina heat retainer and has for its object v-the provision ofa device whereby a conserving of the heat which ordinarily escapes through the flue, may now be-eifected.

Another object of the inventionis the provision of a device which may be interposed between the furnace-and -the-outlet end of the flue s-o that the hot gases which would normally pass through the flue, may be utilized for heating purposes.

Another object of the invention is the provision of a structure of this kind in which air may be drawn into the structure around a chamber through which the escaping hot gases will be caused to circulate.

Another object of the invention is a provision of a device `of this class which will be simple in structure, economical of manufacture, durable, and highly eicient in use.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawing Which forms a part of this specification and in which,

Fig. l is a central vertical sectional view of the invention showing it applied.

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1.

Fig. 3 is a sectional View taken on line 3-3 of Fig. 1.

Fig. 4 is a fragmentary sectional View slightly enlarged illustrating a corner construction.

Fig. 5 is a fragmentary sectional View slightly enlarged illustrating the top corner construction.

In the drawing I have illustrated the invention used with a hot air furnace 8 having the outlet flue 9 at the lower side thereof. This outlet flue 9 is continued by the outlet ue I0, and interposed between the outlet lue sections 9 and I0 is the apparatus of this invention.

The apparatus comprises an outer shell or casing I I on the inner face of which is a layer I2 of asbestos or other suitable insulating material and lying in engagement with the inner face of the layer I2 is the corrugated plate I3 which serves to provide vertically extending air ducts I4. As clearly shown in Fig. l the corrugated plate I3 terminates above the bottom and below the top of the casing.

The casing is closed at its top by the cover I5 which is turned downwardly at its edge and doubled upon itself as at I6 and the doubled over portion is again doubled upon itself t-o form the clamping flange |I which clamps the upper edges of the casing II andthe insulating layer I2 as clearly shown in Fig. 5. The cover I 5 is provided with the upstanding nipple or neck I8 which is closed by the slideableclosure I9 so that the neck 5 or nipple may be opened to any desired degree.

Ahollow box-like structure 20 is mounted at one side so as to establish communication between the interior of the casing! IA and the-atmosphere through the top opening 2| of this` box like struc- 10 ture. This top -opening 2| is closed by a suitable slideable closure 22 so that the degree of opening may be regulated.

Positioned within the casing I I is a housing 24 communicating with which through the bot- 15 tom thereof, is a pipe 25 which is connected in communication with the pipe 9. Baliles 26 and 21 are mounted in the housing 24 so that the escaping hot gases will travel in the casing 24 in the direction of the arrows. This casing 24 is held 20 in spaced relation to the corrugated plate I3 by means of the spacing brackets 28 toprovide the space 29 around the casing 24 and this space 29 communicates with the atmosphere through the opening 2| and through the nipple I8. 25

In the drawing the invention is shown connected with a warm air heating furnace 8 and in communication with the air chamber thereof by the conduit 30 which is mounted on the supporting structure 3| suspended from the bottom 30 32 of the casing.

The construction is such that as the hot gases pass through the pipe 9 and 25 into the housing 24 the air entering the casing II in the space 29 will be heated and drawn through the conduit 35 3! into the warm air chamber of the furnace. In this Way the heat contained in the escaping hot gases will be utilized for heating purposes and a considerable economy in fuel consumption effected. i

In the drawing I have shown a connection in which there would be a forced draft such as is commonly used on oil burners. If a forced draft is not to be used the member 39 would be connected into the casing at its upper end and the 45 opening controlled by the closure I9 would be formed in the bottom of the casing.

A clean-out chute 56 is provided at one side of the housing. The nipple or neck I8 is preferably connected to a conduit which is the cold air inlet 50 leading from the outside thus fresh air may be taken into the casing from the outside while air from the room in which the device is mounted may be admitted through the opening 2|.

While I have illustrated and described the pre- 55 ferred form of my invention, I do not wish to limit myself to the precise details of structure shown, but desire to avail myself of such variations and modifications as may come within the scope of the appended claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patl ent is:

1. A device of the class described adapted for use with a furnace, comprising: a casing having side Walls, a top and a bottom; a corrugated plate mounted on the inner face of each of said side wallsv to provide vertically extending air ducts; a housing positioned within and spaced from the inner surfaces of said corrugated plates to provide between said corrugated plates and said housing an air space; an outlet ue extending through said casing and communicating with the interior of said housing, adjacent the top thereof; a conduit extending through the bottom of said casing and communicating with the interior of said housing through the bottom thereof for communicating the same with the furnace; and a conduit communicating with the interior of said casing at the bottom thereof and communicating the same with said furnace, adjacent its bottom, there being an opening formed in the top of said casing; and a slidable closure for said opening for regulating the size thereof.

2. A device of the class described adapted for use with a furnace, comprising: an enclosing casing having side walls, a top and a bottom, the bottom of said casing, adjacent one side, being downwardly oiset and there being formed through one of the side walls at the offset prtion of said bottom an opening; a conduit in said opening communicating with said furnace; corrugated plates mounted on the inner face of each of said side walls to provide vertically extending air ducts, said plates terminating above the bottom and below the top of said casing; a housing positioned Within said casing; means for maintaining said housing in spaced relation to the inner face of said corrugated plates to provide air space, there being an opening formed at the top of said casing; a slidable closure for said opening for regulating the open area thereof; an extension on one side of said housing at the upper end thereof projected through said casing; an outlet flue communicating with said extension; an extension on said housing, adjacent one side thereof, projecting below the bottom thereof and through the bottom of said casing; and a conduit communicating with said last named extension and communicating with the furnace.

JOHN F. LASZLO. 

